AutoCodes – Chevrolet – P0622 2017 Chevrolet Silverado

P0622 2017 Chevrolet Silverado Code - Generator F-Terminal Circuit

Quick Answer

The Engine Control Module (ECM) uses the Generator field duty cycle signal circuit, or F-terminal circuit, to monitor the duty cycle of the Generator. Common causes include Battery charge, Faulty Generator, Generator harness is open or shorted. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: P0622 2017 Chevrolet Silverado indicates Generator F-Terminal Circuit.
Common causes: Common causes include Battery charge, Faulty Generator, Generator harness is open or shorted.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 391

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jul 15, 2022

Description
Step-by-Step Diagnostic Guide
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0622 2017 Chevrolet Silverado Description

The Engine Control Module (ECM) uses the Generator field duty cycle signal circuit, or F-terminal circuit, to monitor the duty cycle of the Generator. The Generator field duty cycle signal circuit connects to the high side of the field windings in the generator. A Pulse Width Modulated (PWM) high side driver in the voltage regulator turns the field windings ON and OFF. The ECM uses the PWM signal input to determine the generator load on the engine. This allows the ECM to adjust the idle speed to compensate for high electrical loads. The ECM monitors the status of the generator field duty cycle signal circuit. When the ignition is ON and the engine is OFF, the ECM should detect a duty cycle near 0%. When the engine is running, the duty cycle should be between 5 - 99%. The Diagnostic Trouble Code (DTC) will be set if the ignition is ON, and the engine OFF (Prior to Ignition ON, the ignition must have been OFF for at least 5 s), the ECM detects a PWM signal that is greater than 65% for 5 s.

OBDII Code P0622 2017 Chevrolet Silverado - Generator F-Terminal Circuit - AutoCodes.com — P0622 2017 Chevrolet Silverado Code - Generator F-Terminal Circuit

What does this mean?

What are the Possible Causes of the DTC P0622 2017 Chevrolet Silverado?

Battery charge
Faulty Generator
Generator harness is open or shorted
Generator circuit poor electrical connection
Faulty Engine Control Module (ECM)

How to Fix the DTC P0622 2017 Chevrolet Silverado?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0622 2017 Chevrolet Silverado code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the P0622 2017 Chevrolet Silverado code?

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P0622 2017 Chevrolet Silverado Code

1. What does the OBDII code P0622 mean on a 2017 Chevrolet Silverado?

P0622 indicates an issue with the generator F-terminal circuit, which is responsible for monitoring and controlling the alternator's charging system.

2. What are the common symptoms of a P0622 code in a 2017 Chevrolet Silverado?

Symptoms may include a malfunctioning charging system, a dead battery, dim or flickering lights, and the Check Engine Light or battery warning light illuminating.

3. What causes the P0622 code on a 2017 Chevrolet Silverado?

Common causes include a faulty alternator, damaged or corroded wiring in the generator F-terminal circuit, a bad PCM (Powertrain Control Module), or loose electrical connections.

4. Can a bad alternator trigger the P0622 code on my Silverado?

Yes, a failing or malfunctioning alternator is a primary cause of the P0622 code as it directly affects the generator F-terminal circuit.

5. How do I diagnose the P0622 code on a 2017 Chevrolet Silverado?

Diagnose by checking the alternator, inspecting the F-terminal wiring and connectors for damage, testing the voltage output, and scanning for related codes to pinpoint the issue.

6. Can I drive my 2017 Chevrolet Silverado with a P0622 code?

It is not recommended to drive with a P0622 code, as it can lead to battery depletion and potential stalling due to an inoperative charging system.

7. How is the P0622 code fixed on a 2017 Chevrolet Silverado?

Repairs may include replacing a faulty alternator, repairing or replacing damaged wiring and connectors, or reprogramming or replacing the PCM if necessary.

8. How much does it cost to fix the P0622 code on a 2017 Chevrolet Silverado?

The cost varies but typically includes diagnostic fees and the cost of parts like an alternator ($300-$600) or wiring repairs, plus labor charges.

9. Can a weak battery cause the P0622 code to appear?

A weak or failing battery can contribute to charging system issues, but the code specifically relates to the alternator F-terminal circuit. Both should be checked.

10. Does the P0622 code require PCM reprogramming in all cases?

PCM reprogramming or replacement is only necessary if the PCM is confirmed to be faulty after diagnosing other components in the circuit.